CAJ | 학술논문

采用自行研制的十字形振动杆结合共振理论，对液化地基进行了加固处理。基于孔压静力触探(CPTU)试验对共振前后的地基进行测试和分析，指出传统振动密实法适用性评价标准低估了共振法的可加固土类范围。土类指数Ic可用于反映加固处理前后土层状态的改变，进而提出基于土类指数Ic的共振法适用性评价标准。根据标准贯入试验SPT钻孔取样的室内试验结果，建立土类指数Ic与黏粒含量之间的关系式，提出适合于共振法加固的土层中黏粒含量的界限值。分析不同共振方案的抗液化地基处理效果，进一步验证所提出基于土类指数评价标准的可靠性。结果表明，土类指数Ic＜2.40或黏粒含量不高于15%时土层可适合于共振法加固处理。加固方案不同，抗液化处理效果存在差异，3桩中心处理效果最好，其次为2点中心和常规点位。共振法扩展了传统振动密实法的应用局限性，可在液化地基处理领域中推广应用。
채용자행연제적십자형진동간결합공진이론，대액화지기진행료가고처리。기우공압정력촉탐(CPTU)시험대공진전후적지기진행측시화분석，지출전통진동밀실법괄용성평개표준저고료공진법적가가고토류범위。토류지수Ic가용우반영가고처리전후토층상태적개변，진이제출기우토류지수Ic적공진법괄용성평개표준。근거표준관입시험SPT찬공취양적실내시험결과，건립토류지수Ic여점립함량지간적관계식，제출괄합우공진법가고적토층중점립함량적계한치。분석불동공진방안적항액화지기처리효과，진일보험증소제출기우토류지수평개표준적가고성。결과표명，토류지수Ic＜2.40혹점립함량불고우15%시토층가괄합우공진법가고처리。가고방안불동，항액화처리효과존재차이，3장중심처리효과최호，기차위2점중심화상규점위。공진법확전료전통진동밀실법적응용국한성，가재액화지기처리영역중추엄응용。
Combined with resonance theory,improvement of liquefiable foundation with cross-shaped vibration wing is conducted. Piezocone penetration tests are performed on the foundation before and after resonance improvement. It is shown that standards to assess the applicability of traditional vibro-compaction methods are not suitable to resonance method,since silts with fine content larger than 10%can be improved by resonance method. Nevertheless,the change of soil behaviour type index Ic,represents the variation of soil properties after improvement. Therefore,a criterion based on Ic is proposed to evaluate the applicability of resonance method. With results from standard penetration test performed on samples,relationship between Ic and clay content is promoted to determine the maximum clay content in soils to ensure the applicability of resonance method. Finally, variations of improvement to reduce liquefaction potential under different resonance schemes are studied. The reliability of criterion based on Ic is further confirmed. It is concluded that cohesionless soils with Ic<2.40 or clay content less than 15%are suitable to be improved by resonance method. However,the effects of improvement are different depending on resonance schemes. Results show that the center of three resonance columns can be improved best,nest for the center of two resonance columns and routine points respectively. It is shown that resonance method expands the limitation of traditional vibro-compaction method,and can be spreaded in liquefiable foundation improvement.